An Eliz II threepence struck on an unknown flan, having twelve sides, weight 4.6gr. I haven’t spent the time to try and figure out what flan this threepence was struck. Most likely a penny bronze/nickel brass issue for one of the Caribbean Commonwealth nations or it maybe a nickel brass flan of only half the normal thickness.  Since this flan is only half the thickness of a regular threepence the strike is mushy but the coin itself shows little signs of circulation. Extremely rare, certainly the only one I have ever seen.